(Cat? OR feline) AND NOT dog?
Cat? W/5 behavior
(Cat? OR feline) AND traits
Cat AND charact*

This guide provides a more detailed description of the syntax that is supported along with examples.

This search box also supports the look-up of an IP.com Digital Signature (also referred to as Fingerprint); enter the 72-, 48-, or 32-character code to retrieve details of the associated file or submission.

Concept Search - What can I type?

For a concept search, you can enter phrases, sentences, or full paragraphs in English. For example, copy and paste the abstract of a patent application or paragraphs from an article.

Concept search eliminates the need for complex Boolean syntax to inform retrieval. Our Semantic Gist engine uses advanced cognitive semantic analysis to extract the meaning of data. This reduces the chances of missing valuable information, that may result from traditional keyword searching.

Publishing Venue

Related People

Abstract

The current Beep on Bad Data feature will warn pager users if errored data is received, hut not if a page is terminated due to errors. To decide if a message has errors, an error detection algorithm is run on the POCSAG data blocks. If errors are found, the message is marked as errored. If two errored POCSAG blocks are received in a row, the page is terminated, but not marked as errored. The pager can not tell the difference between the trans- mitter turning off at the end of a page, and noise that causes two consecutive blocks to contain errors. In the latter case, a page will be truncated and not marked as errored.

Copyright

Motorola Inc. September 1997

Country

United States

Language

English (United States)

This text was extracted from a PDF file.

At least one non-text object (such as an image or picture) has been suppressed.

This is the abbreviated version, containing approximately
50% of the total text.

Page 1 of 2

0 M M-LA

Technical Developments

IMPROVED BEEP ON BAD DATA FEATURE FOR POCSAG PAGING PROTOCOL

by Ken Lerner and John Burgan

BACKGROUND

The current Beep on Bad Data feature will warn pager users if errored data is received, hut not if a page is terminated due to errors. To decide if a message has errors, an error detection algorithm is run on the POCSAG data blocks. If errors are found, the message is marked as errored. If two errored POCSAG blocks are received in a row, the page is terminated, but not marked as errored. The pager can not tell the difference between the trans- mitter turning off at the end of a page, and noise that causes two consecutive blocks to contain errors. In the latter case, a page will be truncated and not marked as errored.

SOLUTION

A message length field is added to the begin- ning of the page. This allows the pager to know in advance where the end of the page will be, so if the page is terminated early, the page can be marked as errored.

The page length indicator should be transmitted immediately after the pager's address, and before any data is sent~. The page length can be encoded as the first part of the page data, or as a separate POCSAG block that precedes the page data.

In the case of numeric pages, only 2 bits of data are required to describe the normal 4 POCSAG block maximum length that would normally be used for numeric pages. This could easily be encoded in the first "digit" position in the first numeric POCSAG data block (which contains 4 bits and could describe up to 16 blocks in length). See Figure 1. Another approach would be to use the function bits in the POCSAG address field. See Figure 2. These two function bits are only used on

pagers that are using "group" functions, "priority" functions, or multiple phone numbers assigned to a single pag...